devicetree/bindings: add Ingenic Semiconductor vendor prefix

Define a vendor prefix for Ingenic Semiconductor, a vendor of MIPS-based
SoCs. Simply use 'ingenic'.
Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
Acked-by: NRob Herring <robh@kernel.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Hayato Suzuki <hytszk@gmail.com>
Cc: Thierry Reding <treding@nvidia.com>
Cc: linux-kernel@vger.kernel.org
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Arnaud Ebalard <arno@natisbad.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/10129/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -100,6 +100,7 @@ ibm	International Business Machines (IBM)
 idt	Integrated Device Technologies, Inc.
 iom	Iomega Corporation
 img	Imagination Technologies Ltd.
+ingenic	Ingenic Semiconductor
 innolux	Innolux Corporation
 intel	Intel Corporation
 intercontrol	Inter Control Group